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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2000-09-23 23:50:47 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2000-09-23 23:50:47 +0000 |
| commit | 730e2ffebc98977366ec717a0f89345425e02eb1 (patch) | |
| tree | 7ac97764d3e565d7e9a67969d1e742dde6c8856f /src/include/optimizer/planmain.h | |
| parent | 783af51cb1fc27218bec7137c7a138eefb1d76e4 (diff) | |
Back-patch code to deduce implied equalities from transitivity of
mergejoin clauses, and add these equalities to the given WHERE clauses.
This is necessary to ensure that sort keys we think are equivalent
really are equivalent as soon as their rels have been joined. Without
this, 7.0 may create an incorrect mergejoin plan.
Diffstat (limited to 'src/include/optimizer/planmain.h')
| -rw-r--r-- | src/include/optimizer/planmain.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/include/optimizer/planmain.h b/src/include/optimizer/planmain.h index e0a0d84bc8a..12e9d119578 100644 --- a/src/include/optimizer/planmain.h +++ b/src/include/optimizer/planmain.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2000, PostgreSQL, Inc * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: planmain.h,v 1.39 2000/04/12 17:16:42 momjian Exp $ + * $Id: planmain.h,v 1.39.2.1 2000/09/23 23:50:46 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -43,6 +43,8 @@ extern Result *make_result(List *tlist, Node *resconstantqual, Plan *subplan); extern void make_var_only_tlist(Query *root, List *tlist); extern void add_restrict_and_join_to_rels(Query *root, List *clauses); extern void add_missing_rels_to_query(Query *root); +extern void process_implied_equality(Query *root, Node *item1, Node *item2, + Oid sortop1, Oid sortop2); /* * prototypes for plan/setrefs.c |